[llvm-commits] New function attr: ExecuteBarrier to prevent llvm from duplicating barriers

[Rotem, Nadav]

Hi,

Last year we talked about the problem of LLVM duplicating function calls that are considered 'barrier' in data-parallel languages, such as OpenCL.  I implemented Eli's proposal[1] to add a new function attribute (executebarrier) which prevents the duplication of barriers in a number of LLVM optimizations.  I still need to handle the loop unswitch pass and review a few other passes.

Please review the attached patch.

Thanks,
Nadav

[1] - http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-October/026344.html

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